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Re: Possible cheap 2-line 980nm/490nm pen
Goggles could work if they are at least OD3 for 980nm, but you ABSOLUTELY NEED a good LPM (one that can detect <1mW lasers) to be sure it's <1mW with the goggles.
Don't ever try this without LPMing the EXACT same setup (laser+filter/goggles) you're going to use. And be sure your LPM is properly zeroed and test conditions are appropriate - at these power levels even your body heat will influence the LPM readings.
Edit: I got the filter I used from a camera, it was attached on top of the CMOS sensor. But not all cameras are created equal, some IR filters are very crappy (the O-like ones come to mind).
Goggles could work if they are at least OD3 for 980nm, but you ABSOLUTELY NEED a good LPM (one that can detect <1mW lasers) to be sure it's <1mW with the goggles.
Don't ever try this without LPMing the EXACT same setup (laser+filter/goggles) you're going to use. And be sure your LPM is properly zeroed and test conditions are appropriate - at these power levels even your body heat will influence the LPM readings.
Edit: I got the filter I used from a camera, it was attached on top of the CMOS sensor. But not all cameras are created equal, some IR filters are very crappy (the O-like ones come to mind).
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